wtf is this?

unixtime.wtf is a timestamp converter covering every time format modern developers encounter in their day to day.

Paste anything — a Unix timestamp, an ISO 8601 string, a JWT token, a cron expression, a GPS week number, a Julian Day — and it converts instantly to every other format simultaneously.

Simple as that.

Formats supported

Standard: Unix seconds, Unix milliseconds, ISO 8601, RFC 2822, human readable.

Platform-specific: Windows FILETIME, Apple Cocoa time, Excel serial date, NTP timestamp, GPS timestamp, .NET DateTime ticks, WebKit timestamp, TAI, Julian Day Number, Modified Julian Date, Lilian Date, Unix Day.

Specialist tools: JWT decoder, cron parser, relative time converter, batch log normaliser, GPS timestamp calculator, Julian Day converter.

Why unixtime.wtf exists

The dev tools that we've been relying on have been around since time began. They're out of date, missing formats, and they're clunky.

We searched for something better, couldn't find it, so we made it.

Technical notes

All conversions happen client-side. Nothing is sent to a server. unixtime.wtf works offline once loaded.

Built on TanStack Start, deployed on Cloudflare Workers. We made it to be fast and convenient.

A note on ads

You hate ads. I do too. But this tool is free and if it's to stay free, it has to be supported by ads.

We don't overdo it. We don't have endless popups taking focus or obscure conversion results with video streams — we just have three ad placements which cover the costs of running and developing this tool.

If you find unixtime.wtf useful, please whitelist us in your ad blocker. It takes seconds, and gives you all the time conversions in the world.

Thank you.